27491945557465 has 16 divisors (see below), whose sum is σ = 33041751253056. Its totient is φ = 21959287000000.

The previous prime is 27491945557441. The next prime is 27491945557493. The reversal of 27491945557465 is 56475554919472.

It is not a de Polignac number, because 27491945557465 - 2¹⁹ = 27491945033177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26275590 + ... + 27301840.

It is an arithmetic number, because the mean of its divisors is an integer number (2065109453316).

Almost surely, 2^{27491945557465} is an apocalyptic number.

It is an amenable number.

27491945557465 is a deficient number, since it is larger than the sum of its proper divisors (5549805695591).

27491945557465 is a wasteful number, since it uses less digits than its factorization.

27491945557465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034600.

The product of its digits is 1905120000, while the sum is 73.

The spelling of 27491945557465 in words is "twenty-seven trillion, four hundred ninety-one billion, nine hundred forty-five million, five hundred fifty-seven thousand, four hundred sixty-five".